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Fan RPM Help!

post #1 of 11
Thread Starter 
Hello guys. I got three NF-A14 FLX and a NH-D14.

Two of the NF-A14's will run as front intake. One will be rear exhaust.

How many RPM should I run my case fans and NH-D14 so air enters and exits as smooth as possible? Should my exhaust fan be more RPM than my NH-D14?
post #2 of 11
doesnt matter.... like at all.


its not that serious...
Super quiet
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Super quiet
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post #3 of 11
Thread Starter 
I think it does matter.

Decided to put my front intakes at 900RPM, my NH-D14 at 900RPM (both fans), and my rear exhaust at 1200.

Are there any other setups I should try?
post #4 of 11
I just have all my fans running at max Noctua 140mm x2 top exhaust, Noctua 120mm x2 intake front, Cougar 120mm x1 rear exhaust, cpu Xigmatek Dark Knight 120mm x1, Cougar 120mm x1 mounted inside too cool 2 GTX 580's. running all these fans at max and my system runs nice and cool. but I was always told not too have more air coming in then you can exhaust out otherwise the air will sit too long inside the case and just build up more heat.
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Old X58
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post #5 of 11
It's going to be trial and error man.

I wouldn't be too concerned in the Arc Midi, it's such a meshy case that you aren't really able to setup good in>out flow.

I prefer to run negative pressure in the Arc as the front fans at full speed can build up a lot of dust on the filter and the case starts to look ugly.
I run two exhausts (rear and rear top). with a low speed intake infront of lower HDD cage and the other intake is the lowspeed fan on my 120M radiator, this importantly sits further back inside the chassis which alleviates the dust problem somewhat.

Because the filtering is good and there is a lot of ventilation for cool air to get into a case like the Arc, neg pressure has given me the best overall temps and reduced the hotspot between gfx card and psu significantly. In a non mesh case (like the R4) I would be aiming to run almost even pressure as you are describing. In those cases the "butterfly effect" (Small change somewhere can create larger change somewhere else) comes into play a bit more.
Edited by Chickenman - 2/3/13 at 12:47am
post #6 of 11
Thread Starter 
Quote:
Originally Posted by jlhawn View Post

I just have all my fans running at max Noctua 140mm x2 top exhaust, Noctua 120mm x2 intake front, Cougar 120mm x1 rear exhaust, cpu Xigmatek Dark Knight 120mm x1, Cougar 120mm x1 mounted inside too cool 2 GTX 580's. running all these fans at max and my system runs nice and cool. but I was always told not too have more air coming in then you can exhaust out otherwise the air will sit too long inside the case and just build up more heat.
Do you have a lot of dust buildup? One of the reasons I avoided having a negative pressure setup.
post #7 of 11
Quote:
Originally Posted by ZeVo View Post

Do you have a lot of dust buildup? One of the reasons I avoided having a negative pressure setup.

no dust but i forgot too mention my case came with a front intake filter, but my old case was set up the same with no filter and dust was not a problem but i keep my towers up on top of my desk and not on the floor
Old X58
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Old X58
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Windows 7 Pro 64bit LG 29inch widescreen DP LG 29inch widescreen DP Corsair K65 
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post #8 of 11
I'm running R2 with 5x TY-140 series fans. 2x CPU cooler, 2x front intake, 1x bottom intake. All run on same PWM signal from CPU fan mobo socket; 25c @ 660-700rpm idle and 47c @ 950-1000rpm 100% load. Rear vent grill is removed with duct from CPU cooler to back of case and rear top vent is open. CPU cooler intake runs 2-5c above ambient dependent of GPU use (6570 w/ Scythe Setsugen cooler.
post #9 of 11
Thread Starter 
Quote:
Originally Posted by doyll View Post

I'm running R2 with 5x TY-140 series fans. 2x CPU cooler, 2x front intake, 1x bottom intake. All run on same PWM signal from CPU fan mobo socket; 25c @ 660-700rpm idle and 47c @ 950-1000rpm 100% load. Rear vent grill is removed with duct from CPU cooler to back of case and rear top vent is open. CPU cooler intake runs 2-5c above ambient dependent of GPU use (6570 w/ Scythe Setsugen cooler.
Nice temps. I'll have to remove the rear grill sometime.

Anyway, I changed my config to intake at 1050RPM x2, NH-D14 is 900RPM, and rear exhaust is 1050RPM. Going to run Prime95 to see temps. I cannot even hear them running. I love Noctua fans!
post #10 of 11
Keep in mind that air moving through things makes noise. The faster/more it moves the noisier it becomes. If I set my fans in open space at 1050rpm they are virtually silent, but in system I can hear the air being sucked through grill & filter and pushed/pulled through cooler.
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